Crowding Ratio in Young Normally Sighted Children

被引：6

作者：

Dekker, Marjoke J. ^{[1
]}

Pilon, Florine ^{[1
]}

Bijveld, Mieke M. C. ^{[1
]}

de Wit, Gerard C. ^{[1
]}

van Genderen, Maria M. ^{[1
]}

机构：

[1] Bartimeus Inst Visually Impaired, Ophthalmol, Zeist, Netherlands

来源：

STRABISMUS | 2012年 / 20卷 / 02期

关键词：

Children; crowding; screening; infant vision development; visual impairment;

D O I：

10.3109/09273972.2012.680233

中图分类号：

R77 [眼科学];

学科分类号：

100212 ;

摘要：

Purpose: To determine normal values of the crowding ratio (CR) in children. Methods: Of 62 normally sighted primary school children aged 4-12 years old the CR was determined both for distance and near vision. The examinations were performed using commonly available test charts based on the LEA symbols. Results: At near, the CR was significantly better than at distance and for all ages < 2.0. The upper limit of the CR at distance was < 2.0 from age six. Conclusion: With commonly available tests the CR can easily be determined in school age children. For children > 6 years of age, a CR > 2.0 (i. e. at least 3 lines difference between the result of a single optotype acuity test and a line acuity test) is suspicious and warrants further investigation. It may, for example, be a sign of cerebral visual impairment (CVI).

引用

页码：49 / 54

页数：6

共 18 条

[1] ATKINSON J, 1983, ACTA OPHTHALMOL, P18
[2] ATKINSON J, 1988, ACTA OPHTHALMOL, V66, P505
[3] Atkinson J., 1987, ORTHOPTIC HORIZONS, P482
[4] Becker R H, 2000, Strabismus, V8, P209
[5] BRANT JC, 1976, DEV MED CHILD NEUROL, V18, P568
[6] Learning to identify crowded letters: Does it improve reading speed?
Chung, Susana T. L.
[J]. VISION RESEARCH, 2007, 47 (25) : 3150 - 3159
[7] FLOM MERTON C., 1963, SCIENCE, V142, P979, DOI 10.1126/science.142.3594.979
[8] DEVELOPMENT OF VISUAL LINE ACUITY IN HUMANS
HOHMANN, A
HAASE, W
[J]. OPHTHALMIC RESEARCH, 1982, 14 (02) : 107 - 112
[9] HYVARINEN L, 1980, ACTA OPHTHALMOL, V58, P507
[10] Jacobson L, 1996, DEV MED CHILD NEUROL, V38, P724

← 1 2 →